#!/bin/bash

# Prints out the CPU load percentage


get_load()
{
	local PREFIX=' '
	# Get the first line with aggregate of all CPUs
	cpu_last=($(head -n1 /proc/stat))
	cpu_last_sum="${cpu_last[@]:1}"
	cpu_last_sum=$((${cpu_last_sum// /+}))

	sleep 0.05

	cpu_now=($(head -n1 /proc/stat))
	cpu_sum="${cpu_now[@]:1}"
	cpu_sum=$((${cpu_sum// /+}))

	cpu_delta=$((cpu_sum - cpu_last_sum))
	cpu_idle=$((cpu_now[4]- cpu_last[4]))
	cpu_used=$((cpu_delta - cpu_idle))
	cpu_usage=$((100 * cpu_used / cpu_delta))
	bfh='%'
	# Keep this as last for our next read
	cpu_last=("${cpu_now[@]}")
	cpu_last_sum=$cpu_sum

	#echo "$PREFIX$cpu_usage%"
	printf "$PREFIX$cpu_usage$bfh"
}

get_load
